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Subject[PATCH 09/10] fblog: register all handlers on module-init
Date
We now create a new "fblog" device when initializing the fblog module. We
register the "active" sysfs-file with it so user-space can now access
fblog. We also register the framebuffer-notifier and console-handler so
fblog is ready to go.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
---
drivers/video/console/fblog.c | 59 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 59 insertions(+)
diff --git a/drivers/video/console/fblog.c b/drivers/video/console/fblog.c
index 79bfbcc..9d3b072 100644
--- a/drivers/video/console/fblog.c
+++ b/drivers/video/console/fblog.c
@@ -92,6 +92,7 @@ struct fblog_fb {
};

static struct fblog_fb *fblog_fbs[FB_MAX];
+static struct device *fblog_device;
static atomic_t fblog_active;

static void fblog_buf_resize(struct fblog_buf *buf, size_t width,
@@ -609,13 +610,71 @@ static ssize_t fblog_dev_active_store(struct device *dev,
static DEVICE_ATTR(active, S_IRUGO | S_IWUSR | S_IWGRP, fblog_dev_active_show,
fblog_dev_active_store);

+static void fblog_dev_release(struct device *dev)
+{
+ kfree(dev);
+ module_put(THIS_MODULE);
+}
+
static int __init fblog_init(void)
{
+ int ret;
+
+ fblog_device = kzalloc(sizeof(*fblog_device), GFP_KERNEL);
+ if (!fblog_device) {
+ pr_err("fblog: cannot allocate device\n");
+ ret = -ENOMEM;
+ goto err_out;
+ }
+
+ __module_get(THIS_MODULE);
+ device_initialize(fblog_device);
+ fblog_device->class = fb_class;
+ fblog_device->release = fblog_dev_release;
+ dev_set_name(fblog_device, "fblog");
+
+ ret = device_add(fblog_device);
+ if (ret) {
+ pr_err("fblog: cannot add device\n");
+ goto err_dev;
+ }
+
+ ret = fb_register_client(&fblog_notifier);
+ if (ret) {
+ pr_err("fblog: cannot register framebuffer notifier\n");
+ goto err_dev_rm;
+ }
+
+ ret = device_create_file(fblog_device, &dev_attr_active);
+ if (ret) {
+ pr_err("fblog: cannot create sysfs entry\n");
+ goto err_fb;
+ }
+
+ register_console(&fblog_con_driver);
+
return 0;
+
+err_fb:
+ fb_unregister_client(&fblog_notifier);
+err_dev_rm:
+ device_del(fblog_device);
+err_dev:
+ put_device(fblog_device);
+err_out:
+ return ret;
}

static void __exit fblog_exit(void)
{
+ unregister_console(&fblog_con_driver);
+ device_remove_file(fblog_device, &dev_attr_active);
+ device_del(fblog_device);
+ fb_unregister_client(&fblog_notifier);
+ console_lock();
+ fblog_deactivate();
+ console_unlock();
+ put_device(fblog_device);
}

module_init(fblog_init);
--
1.7.10.4


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